External magnetic-field change changes material magnetization, after a time delay {hysteresis, magnetism}|. In motors and generators, external magnetic-field changes cycle, and material changes have time-delayed cycles {hysteresis loop}, with heat losses. Magnetic memory devices {twistor, memory} can use hysteresis loops.
Physical Sciences>Physics>Electromagnetism>Magnetism>Permeability
5-Physics-Electromagnetism-Magnetism-Permeability
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Date Modified: 2022.0224